文献类型：期刊文献

英文题名：Ag+ anchored on sulfonic functionalized mesoporous silica towards efficient liquid phase Olefin-Paraffin separation

作者：Li, Yunlu[1];Li, Liyuan[2];Zhao, Hongliang[1];Liu, Jichang[1,3];Zhu, Kake[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Shanghai Res Inst Petrochem Technol, Sinopec, Shanghai 201208, Peoples R China;[3]Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China

年份：2023

卷号：322

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20230125570);WOS:【SCI-EXPANDED(收录号:WOS:001057365000001)】；

基金：Authors are grateful for financial support from National Natural Science Foundation of China (Project U22B20141) and National Natural Science Foundation of China (Project 22178111) .

语种：英文

外文关键词：Mesoporous silica; Liquid phase adsorption; Olefin-paraffin separation; & pi;-complexation

摘要：Separation of olefin-paraffin gas mixtures has attracted enormous research endeavors as a replacement of the currently used, energy-intensive cryogenic distillation process, while liquid phase olefin-paraffin separation has remained less exploited. The challenge lies in that the difference in physical properties between C6-C8 olefins and paraffins tend to diminish as C = C bond fraction becomes smaller when alkyl chain grows longer. On the other hand, satisfactory adsorption capacity for these bulky molecules requires the use of porous materials beyond microporosity, i.e., mesoporous materials with large pore volume and size, which, nonetheless, lack adsorption selectivity to guarantee satisfactory separation factors. Here, we demonstrate that functionalization of mesoporous silica MCM-41 surface by -COO-, -Ph-SO3- and -SO3- functional groups can be used to immobilize Ag+, which turns the otherwise unselective porous solid into an olefin selective molecular sieving material suitable for liquid phase binary mixture separations. The results underline that ionically anchored Ag+ with intact complexation orbitals outperform coordinatively immobilized Ag+ (on -NH2 or -SH groups), in terms of antileaching property, olefin separation factor, as well as recyclability. Small mesopore size can boost olefin adsorption selectivity as accommodated olefins compressed the available space for access of paraffins. Adsorption evaluation for binary C6 to C8 olefin-paraffin mixtures separations discloses that the total adsorption capacity declines, while the separation factor increases, with increasing molecule size.